Physical and electrochemical performance of Mn-doped zinc oxide electrode material for asymmetric supercapacitor

IF 3.2 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Journal of the Indian Chemical Society Pub Date : 2024-10-11 DOI:10.1016/j.jics.2024.101416
Manisha Yadav, Sanju Choudhari, Pradeep Kumar, Pura Ram
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Abstract

Manganese-doped zinc oxide has emerged as a promising material for high-performance supercapacitors (SCs) due to its enhanced electrochemical properties, including improved charge storage capacity and cycling stability. Pristine Zinc oxide (ZO) and Manganese (Mn) doped (2 wt % and 4 wt %) zinc oxide (hereby labeled: ZO, 2MZO, and 4MZO) derivatives have been synthesized via an aqueous sol-gel-based co-precipitation method. The physical characterizations of synthesized samples have been performed using TGA, XRD, FESEM, and BET. The XRD has confirmed the phase pure hexagonal wurtzite structure synthesis of ZO, 2MZO, and 4MZO samples. The FE-SEM images revealed that synthesized material had shown the mixed morphology as polyhedral particles, rods, and flakes in the nano region. Mn-doped has increased specific surface by 132 % compared to bare ZO. The electrochemical characterization techniques, including CV, GCD, and EIS, have been used to access electrochemical parameters using an aqueous 4 M KOH electrolyte. A detailed CV analysis was also carried out to investigate the capacitive contribution of the material in cycling. The electrochemical characterization techniques (CV, GCD, and EIS) have been performed to access electrochemical parameters using an aqueous 4 M KOH electrolyte. The 4MZO electrode material has shown an enhancement in specific capacitance (164.28 Fg-1) compared to pristine ZO (42.83 Fg-1). The EIS study revealed that the 4MZO has the lowest internal impedance 0.30 Ω compared to 0.70 Ω, and 2.60 Ω for 2MZO and ZO, respectively.

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用于不对称超级电容器的掺锰氧化锌电极材料的物理和电化学性能
掺杂锰的氧化锌具有更强的电化学特性,包括更高的电荷存储容量和循环稳定性,因此已成为高性能超级电容器(SC)的理想材料。我们采用水溶胶-凝胶共沉淀法合成了原始氧化锌(ZO)和掺杂锰(Mn)(2 wt % 和 4 wt %)的氧化锌(以下分别标为 ZO、2MZO 和 4MZO)衍生物。使用 TGA、XRD、FESEM 和 BET 对合成样品进行了物理表征。XRD 证实了 ZO、2MZO 和 4MZO 样品是纯六方菱面体结构。FE-SEM 图像显示,合成材料在纳米区域呈现出多面体颗粒、棒状和片状的混合形态。与裸 ZO 相比,掺锰的比表面增加了 132%。电化学表征技术包括 CV、GCD 和 EIS,使用 4 M KOH 水溶液电解质获取电化学参数。此外,还进行了详细的 CV 分析,以研究材料在循环过程中的电容贡献。采用电化学表征技术(CV、GCD 和 EIS),使用 4 M KOH 水溶液电解质获得电化学参数。与原始 ZO(42.83 Fg-1)相比,4MZO 电极材料显示出更高的比电容(164.28 Fg-1)。EIS 研究表明,与 2MZO 和 ZO 的 0.70 Ω 和 2.60 Ω 相比,4MZO 的内阻最低,仅为 0.30 Ω。
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来源期刊
CiteScore
3.50
自引率
7.70%
发文量
492
审稿时长
3-8 weeks
期刊介绍: The Journal of the Indian Chemical Society publishes original, fundamental, theorical, experimental research work of highest quality in all areas of chemistry, biochemistry, medicinal chemistry, electrochemistry, agrochemistry, chemical engineering and technology, food chemistry, environmental chemistry, etc.
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